If rumor is right, it looks like AT&T is going to start their attack plan to beat the Verizon iPhone. A source has leaked to Gear Live a Best Buy company memo that says that AT&T will be changing text messaging plans to $10 for 1000 messages and $20 for unlimited texting. Each additional message will remain $.10. It says that new plans won’t be offered until January 23, and those who have the old plans – $5 for 200 and $15 for 1500 – can chose to keep them if they like. (Right now, Verizon’s plans are $5 for 250 messages, $10 for 500 out of network messages and $20 for unlimited messaging. Each additional message over your limit is $.10)

Another memo, this time a training document also posted by Gear Live, shows that Best Buy will not be carrying the Verizon iPhone 4 at launch and is encouraging employees to try and get customers to stick with AT&T by arguing that the Verizon iPhone 4 is going to slowly move at 3G speeds, and new customers won’t be able to trade in for a 4G capable phone until 2012. Even though AT&T also uses the 3G network, their GSM is faster than Verizon’s CDMA.